WO2020091460A1

WO2020091460A1 - Projection device

Info

Publication number: WO2020091460A1
Application number: PCT/KR2019/014598
Authority: WO
Inventors: 조영진; 이승재; 유동헌; 이병호
Original assignee: 서울대학교산학협력단
Priority date: 2018-11-01
Filing date: 2019-10-31
Publication date: 2020-05-07
Also published as: KR20200050290A; US11429016B2; US20220019138A1; KR102135888B1

Abstract

The present invention relates to a projection device, and more particularly, to a projection device comprising: a projector module for providing a predetermined image on a predetermined screen; and a lens module disposed between a user's eye and the screen. The projector module comprises: a display module for providing a predetermined image; and a backlight module which provides light to the display module so that an image provided from the display module is formed on the screen, wherein the display module is located between the backlight module and the screen, the display module induces a convergence response in the user's eye so that the image formed on the screen has a predetermined convergence distance, and the lens module is configured to induce a focus response in the user's eye so that the focal length of the image reproduced in the display module is varied within a predetermined range.

Description

Projection device

The present invention relates to a projection device, and more specifically, a projector module for providing a predetermined image on a predetermined screen; A lens module disposed between the user's eye and the screen; Including, The projector module, A display module for providing a predetermined image; And a backlight module that provides light to the display module so that an image provided from the display module is formed on the screen. The display module is located between the backlight module and the screen, and the display module induces a convergence reaction to the user's eyes so that the image formed on the screen has a predetermined convergence distance, and the lens module The present invention relates to a projection device configured to induce a focus response to a user's eye to vary a focal length of an image reproduced in the display module within a predetermined range.

A general binocular display uses a method of causing a virtual image of a general display panel to be placed at a remote location from a user. This binocular display provides two different images for both eyes to induce a convergence reaction. For example, in the case of a movie theater, a passive stereo method using two projectors is used, and in a typical home, it is driven at 120 Hz, and an active stereo method that alternately provides images to the left / right is used.

Such a binocular display induces a convergence reaction to a user by providing an appropriate parallax according to a desired depth to a virtual image displayed on both eyes. On the other hand, since each virtual image entering the monocular is a two-dimensional image and does not have depth direction information, a user's focus response cannot be induced. Therefore, a general binocular display using binocular parallax causes a focus-convergence distance mismatch.

The convergence response corresponds to the angle at which the directions of both eyes of the user gather, and the focus response corresponds to the thickness of the lens of each eye of the user. These two reactions occur unconsciously depending on the position and depth of the object the user is looking at, and are related to each other, reversibly affecting each other. The thickness of the lens may be adjusted to the depth felt according to the convergence reaction, and the angle of both eyes may be adjusted to the depth felt according to the focus response. Therefore, when the depths from which these two reactions are induced do not match, a focus-convergence mismatch occurs in which the user's convergence and focus continuously change.

The focus-convergence mismatch will be described below with reference to FIG. 1. The focal length (N) controlled by the lens of the eyeball is aligned with the screen on which the image is formed. However, due to the binocular parallax, the angle at which both eyes see the object is formed at a distance away from the screen, so that the convergence distance M is inconsistent with the focal length N. When looking at real objects, there is no discrepancy between these focal-convergence distances. Because binocular parallax is inevitably caused by such a focus-convergence distance due to technical characteristics, many studies have been conducted on this as it is considered to be the biggest cause of eye fatigue.

To solve the focus-convergence mismatch, a variable focus eyepiece display capable of modulating the depth of the virtual image has been proposed. The most representative method is a method of modulating the depth of a physical virtual image by adding a varifocal lens to an enlarged optical system. The feature of the above technique is to minimize the focus-convergence mismatch by displaying a virtual image at an appropriate depth according to the user's viewpoint.

In the case of a variable focus eyepiece display, since it still shows a two-dimensional image, it is difficult to induce a complete focus response, and there is a technical difficulty in accurately tracking a user's viewpoint. In order to compensate for this, it is possible to use a method of dividing images of different depths in time and displaying them at once, which causes resolution and frame degradation. Considering that the typical display currently used is driven at a speed of 60 to 240 Hz, the related technology can express only up to four depths of 60 Hz within one frame. However, considering the wide focus range of the user, the four depths are insufficient to solve the focus-convergence mismatch. Through image processing, the depth expression range may have up to 0.6 diopters per depth (up to about 2.4 diopters), but in this case, the resolution is deteriorated.

Therefore, there is a need for a projection device capable of resolving a focus-convergence mismatch in a manner different from the prior art.

The present invention has been made to solve the above-mentioned problems, and has an object to provide a projection apparatus for solving a focus-convergence mismatch. Specifically, a projector module that provides a predetermined image on a predetermined screen; A lens module disposed between the user's eye and the screen; Including, The projector module, A display module for providing a predetermined image; And a backlight module that provides light to the display module so that an image provided from the display module is formed on the screen. The display module is located between the backlight module and the screen, and the display module induces a convergence reaction to the user's eyes so that the image formed on the screen has a predetermined convergence distance, and the lens module The object of the present invention is to provide a projection device configured to induce a focus response to a user's eye to vary a focal length of an image reproduced in the display module within a predetermined range.

Projection apparatus according to the present invention, a projector module for providing a predetermined image on a predetermined screen; A lens module disposed between the user's eye and the screen; Including, The projector module, A display module for providing a predetermined image; And a backlight module that provides light to the display module so that an image provided from the display module is formed on the screen. The display module is located between the backlight module and the screen, and the display module induces a convergence reaction to the user's eyes so that the image formed on the screen has a predetermined convergence distance, and the lens module Silver is configured to induce a focus response to a user's eye to vary a focal length of an image reproduced in the display module within a predetermined range.

According to one embodiment, the control device further comprises; the control device, the operation of the lens module and the operation of the backlight module to synchronize with each other, the convergence distance of the image provided from the display module and the lens module Induce focal length to match.

According to an embodiment, when the image provided from the display module has a focal length of a specific value by the lens module, the control device operates the backlight module to provide light to the display module. By doing so, the image provided by the display module has a specific focal length and is incident on the user's eyes.

According to an embodiment, when the image provided from the display module has image data and depth distance data, when the depth distance of the image provided from the display module and the focal length by the lens module match, the backlight module This light is provided so that the focal-convergence distances match.

According to an embodiment, the backlight module includes a plurality of light emitting elements.

According to an embodiment, the light-emitting elements are arranged with a predetermined array at the rear of the display module, and the control device controls each of the light-emitting elements to be binary driven (on / off).

According to an embodiment, the backlight module includes a plurality of light source units and a mirror module that reflects light generated by the light source unit to generate reflected light, and the control device changes the angle of the mirror module to change the reflected light. This is to selectively enter the display module.

According to an embodiment of the present disclosure, when the convergence distance of the image reproduced by the display module and the focal length of the image by the lens module coincide with each other, the reflected light reflected by the mirror module is displayed in the control module. To join.

According to an embodiment, the display module further includes an optical module that allows the reflected light reflected from the mirror module to have a predetermined area.

According to one embodiment, the lens module is composed of a variable focus lens that linearly increases or decreases a focal length of an image generated by the display module within a predetermined sweep range for a predetermined time.

According to one embodiment, the control device is configured to shift the sweep range of the variable focus lens.

According to an embodiment, the backlight module operates to provide light to the display module when the image reproduced in the display module has a focal length of a specific value by the lens module, thereby reproducing the image reproduced in the display module The backlight module includes a plurality of light emitting elements arranged with a predetermined array at the rear of the display module, and a control device for controlling the operation of the light emitting element. The control device controls each light emitting element to be binary driven (on / off), wherein the light emitting element has a driving speed N times per frame, and the convergence distance of the image reproduced in the display module and the When the focal length of the image by the lens module coincides, the control device A variable that linearly increases or decreases the focal length of an image generated by the display module within a predetermined range by operating a light emitting device to provide light to the display module so that a focal-convergence distance coincides. Consists of a focus lens, the variable focus lens reciprocates a predetermined depth range once per frame.

According to one embodiment, the one frame is 1/60 second, and the binary driving speed N of the light emitting element is 100 times per frame.

According to an embodiment, the backlight module operates to provide light to the display module when the image reproduced in the display module has a focal length of a specific value by the lens module, thereby reproducing the image reproduced in the display module It has a specific focal length and makes it enter the user's eyes, and the backlight module is disposed between a plurality of light source units, a mirror module that reflects light generated by the light source unit, and generates reflected light, and is disposed between the light source unit and the mirror module. A collimating lens that allows light generated by the light source unit to have a predetermined area and enters the mirror module, and is disposed between the mirror module and the display module, and the reflected light reflected from the mirror module has a predetermined area and displays the Optical module to enter the module Including, the mirror module includes a mirror module, and a control unit for varying the angle of the mirror module, so that the reflected light selectively enters the display module, and the control unit converges the images reproduced in the display module When the distance and the focal length of the image by the lens module coincide, reflected light reflected by the mirror module enters the display module, but the mirror module by the control unit drives M times per frame. The lens module is composed of a variable focus lens that linearly increases or decreases a focal length of an image generated by the display module within a predetermined range, wherein the variable focus lens has a predetermined depth range once for one frame. Round-trip.

According to one embodiment, the one frame is 1/60 second, and the driving speed M of the mirror module is 100 times per frame.

In the projection apparatus according to the present invention, when the image reproduced in the display module has a focal length of a specific value by the lens module, the backlight module may provide light to the display module. Therefore, the image generated by the display module may be formed on the screen in a state having a specific focal length so that it enters the user's eyes. In addition, when the lens module has a different focal length, light is not provided to the display module so that the image does not enter the user's eyes.

Therefore, the projection apparatus according to the present invention can induce the convergence distance and the focal length of the image reproduced in the display module to match. That is, when the convergence distance induced by the display module and the focal length induced by the lens module coincide with each other, the backlight module operates. Therefore, it is possible to make the focal-convergence distance coincide. Therefore, the focus-convergence mismatch, which is a problem of the conventional projection apparatus, can be solved.

1 is a conceptual diagram showing a focus-convergence mismatch phenomenon.

2 is a view showing the structure of a projection apparatus according to an embodiment of the present invention.

3 is a view showing the structure of a projection apparatus according to an embodiment of the present invention.

4 and 5 are diagrams showing an operation example of the projection apparatus according to the present invention.

Projection apparatus according to the present invention, a projector module for providing a predetermined image on a predetermined screen; A lens module disposed between the user's eye and the screen; Including, The projector module, A display module for providing a predetermined image; And a backlight module that provides light to the display module so that an image provided from the display module is formed on the screen. The display module is located between the backlight module and the screen, and the display module induces a convergence reaction to the user's eyes so that the image formed on the screen has a predetermined convergence distance, and the lens module Silver is configured to induce a focus response to the user's eye to vary a focal length of an image reproduced in the display module within a predetermined range.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

The projection apparatus according to the present invention may include a projector module 100 and a lens module 200. Here, the projector module 110 may include a backlight module 120.

The projector module 100 may be configured as a device that provides an image to the screen S as a predetermined projection device.

The display module 110 is a device that provides a predetermined image. The display module 110 induces a convergence reaction in the user's eyes. Therefore, the image reproduced in the display module 110 has a predetermined convergence distance and is formed in the user's eye T.

Conventional techniques may be applied to a device and a method of operating the induction convergence reaction. The apparatus and operating method of the display module 110 that induces a convergence reaction may be different in each embodiment, and are not limited to a specific method and apparatus.

For example, the display module 110 may induce a convergence reaction by providing different images to both eyes of a user.

For example, in the case of using 3D glasses, an image projected on a screen may be separated, and images of different colors may be provided to the left and right eyes, respectively, to induce binocular parallax and convergence reaction.

The backlight module 120 is located behind the display module 110. That is, the display module 110 has an arrangement positioned between the screen S and the backlight module 120. The backlight module 120 provides light to the display module 110 so that an image provided from the display module 110 is formed on the screen S.

2, the backlight module 120 of the projection apparatus according to an embodiment of the present invention includes a predetermined PCB 122 and a plurality of light emitting elements 124 mounted on the PCB 122 can do.

The PCB 122 is located behind the display module 110, and the light emitting device 124 is mounted on the PCB 122 to irradiate light toward the display module 110. A plurality of light emitting devices 124 may be mounted on the PCB 122, and may be disposed in a predetermined array form. That is, a predetermined number of light emitting elements 124 may be arranged per predetermined unit area, for example, one light emitting element 124 may be disposed per pixel.

The lens module 200 is disposed between the user's eye T and the screen S.

The lens module 200 induces a focus reaction on the user's eye T. Therefore, the image reproduced in the projector module 100 has a predetermined focal length and is formed in the user's eye T. For example, the lens module 200 may be a device mounted on glasses worn by a user.

The lens module 200 may vary the focal length of the user's eye T within a predetermined range. According to an embodiment, the lens module 200 may be configured as a variable focus lens. Therefore, the lens module 200 may linearly increase or decrease the focal length of the user's eye T within a predetermined depth range.

As an example, the variable focus lens may sweep the predetermined depth range 60 times per second. Here, 1/60 second can be said to be 1 frame. Therefore, the focal length by the variable focus lens can reciprocate a predetermined depth range once during one frame, and can also reciprocate the predetermined depth range 60 times during 1 second. For example, it can be varied from a negative diopter (concave lens) to a positive diopter (convex lens) at a driving speed of 60 Hz. However, the driving speed of the variable focus lens is not necessarily limited to 60 Hz.

For example, the focal length of the varifocal lens may be linearly increased from 50 mm to 120 mm for 1/120 seconds, and then returned to 50 mm for 1/120 seconds. At this time, the virtual image of the display module 110 formed by the variable focus lens may be swept within the range of ∞ to 8.5 cm. Since the 1/60 second is a time corresponding to one frame observed by the viewer, the user can recognize the images floating therebetween as one temporally combined image.

Meanwhile, the sweep range may have a shiftable configuration. For example, the movement of the sweep range may be made by the control device 300.

The variable focus lens may have any configuration to vary the focal length as described above. For example, the position of the lens may be linearly variable, or the thickness may be variable, or may have a configuration in which a plurality of lenses are provided and the distance between the lenses is variable.

However, the present invention is not limited to this example, and when a specific optical system or physical system can perform the above function, the above form can be substituted. In addition, the varifocal lens may be replaced with other varifocal optics for field of view, eye-box, and the like. For example, there may be a method of locating the variable focus lens in the relay optical system.

The control device 300 may control the operation of the projector module 100 and the lens module 200.

First, the control device 300 may control each light emitting element 124 to be binary driven (on / off). Accordingly, the control device may turn on / off each light emitting element 124.

Therefore, when the light emitting device 124 located at a specific pixel is turned off, the image of one pixel of the display module 110 located at a point corresponding to the position of the light emitting device 124 is displayed in the user's eye T. Do not join. In addition, when the light emitting device 124 located at a specific position is turned on, an image of one pixel of the display module 110 located at a point corresponding to the position of the light emitting device 124 is displayed on the user's eye T. You will join.

In addition, the control device 300 may turn on / off each light emitting element 124 at a specific time. That is, the image of the display module 110 enters the user's eye T when the light emitting element 124 is turned on, and does not enter the user's eye T when the light emitting element 124 is turned off. do.

According to an embodiment, the binary driving speed of the light emitting element 124 by the control device 300 may have a speed of 60 Hz or more. That is, multiple on / off is possible during one frame, and spatial modulation by on / off operation is possible. For example, assuming that the spatial modulation reaction speed of the backlight module 120 (the speed at which the control device 300 turns on / off the light emitting element 124) is 1/6000 seconds (6000 Hz), each light emitting element ( The spatial modulation by 124) may be performed 100 times per frame. That is, the light emitting device 124 may operate on / off 6000 times per second, but is not limited thereto.

In addition, the control device 300 may control the operation of the lens module 200 to vary the focal length. That is, the lens module 200 is composed of a variable focus lens that linearly increases or decreases the focal length of the user's eye T within a predetermined depth range, and the control device 300 controls the operation of the variable focus lens can do.

The operation examples of the projector module 100, the lens module 200, and the control device 300 are as follows. For example, the focal length by the variable focus lens may reciprocate a predetermined depth range once during one frame. At this time, the backlight module 120 provides light when the image of the display module 110 has a specific focal length by the variable focus lens, so that the image generated by the display module 110 has a specific focal length and the user's It can be made to enter the eye T. At this time, the time when the backlight module 120 provides light may be such that the focal length by the variable focus lens and the convergence distance of the display module 110 coincide. Therefore, an image in which the focal length and the convergence distance match each other can be provided to the user. That is, the mismatch between the convergence distance and the focal length can be resolved.

By the control device 300, the operation of the lens module 200 and the operation of the light emitting element 124 may be synchronized with each other. For example, the control device 300, when the convergence distance by the image provided from the display module 110 and the focal length of the image by the lens module 200 coincide, the display module 110 It can operate to provide light for.

For example, the image reproduced in the display module 110 may have predetermined image data and convergence distance data. Accordingly, the control device 300 may operate so that the light emitting element 124 provides light when the convergence distance of the image stored in the display module 110 and the focal length by the lens module 200 are the same. . Accordingly, the control device 300 may include a predetermined control algorithm. That is, in the control device, when the lens module 200 has a specific focal length, a control algorithm in the control device 300 may operate the light emitting device.

In addition, the control device 300 may shift the sweep range of the variable focus lens of the lens module 200. For example, there is a possibility that distortion of the image depth may occur depending on the viewing position of the user, and the control device 300 shifts the sweep range of the lens module 200 according to the viewing position of the user, such image depth Distortion can be prevented. The control device 300 may include a predetermined algorithm that performs movement of the sweep range of the lens module 200.

3 is a view showing the structure of a projection apparatus according to an embodiment of the present invention. In the present embodiment, the lens module 200 is the same as described above, and since only the projector module 400 and the control device 500 have different configurations, redundant description is avoided, and the projector module 400, and The control device 500 will be described.

The projector module 400 of the projection apparatus according to an embodiment of the present invention includes a display module 410 and a backlight module 420.

At this time, the display module 410 may be configured to include a predetermined projection member to be suitable for projection of an image. For example, the display module 410 may include a predetermined optical module including a mirror 412, a prism 414, an LCD 416, and a projector 418. In addition, such an optical module may include various devices such as a collimating lens, a relay optical system, and a prism module. The optical module may be a predetermined magnification and relay optical system. The magnification and relay optical system serves to enlarge the area of the light provided by the mirror module 440 to be described later and relay it to the display surface. That is, by providing an optical module composed of a relay optical system, it is possible to reproduce as if the DMD is directly on the display module 410 side. In addition, when the optical module performs an enlargement function, the mirror module 440 of the backlight module 420 may function as a backlight larger than an actual DMD size (1 inch). The members may be projection devices according to the prior art, and detailed description will be omitted.

The backlight module 420 may include a light source unit 430 and a mirror module 440.

The light source unit 430 may be disposed at one position of the backlight module 420. The light source unit 430 may include a predetermined PCB and a light emitting device. According to an example, the light source unit 430 is disposed on one side of the backlight module 420 and may irradiate light in one direction.

The mirror module 440 reflects the light generated by the light source unit 430 and provides it to the display module 410. The mirror module 440 may include a plurality of mirror devices that reflect light and have variable orientation angles. The mirror module 440 may be operated and controlled by the control device 500, or a control unit for controlling the orientation angle of the mirror module 440 may be separately provided. The mirror module 440 may be arranged in a predetermined array form. That is, a predetermined number of mirror modules 440 may be arranged per predetermined unit area. That is, one mirror module 440 may be disposed for each pixel. In addition, the control device 500 may control the orientation angle of each mirror module 440.

For example, the mirror module 440 may be configured as a small digital mirror device (DMD).

According to an embodiment, the driving speed of the mirror module 440 by the control device 500 or the control unit may have a speed of 60 Hz or more. That is, multiple operations are possible during one frame, and spatial modulation can be performed by such operations. For example, assuming that the modulation response speed of the mirror module 440 is 1/6000 second (6000 Hz), each small digital mirror device can modulate 100 times per frame.

The meaning of such spatial modulation will be described in more detail below.

The lens module 200 composed of a variable focus lens may scan a predetermined depth range 60 times per second. The variable focus lens continues to repeat this operation, and it is assumed that an appropriate video is reproduced at 60 Hz in the display module 410. At this time, during 1/60 second, that is, 1 frame, the variable focus lens reciprocates a predetermined depth range once, and a still image is reproduced in the display module 410. If the backlight module 420 provides light to all pixels at a fixed value, the still image is uniformly observed at all depths. On the other hand, in the projection apparatus according to the present invention, the backlight module 420 is operated several times during one frame, so that it is possible to provide light only at a specific timing. Accordingly, when the variable focus lens reaches a predetermined depth, when the backlight module 420 is turned on, an image of the corresponding depth is provided to the user. At this time, the backlight module 420 may be turned on / off 100 times while the variable focus lens reciprocates the depth range once. Therefore, the reciprocating distance of the variable focus lens is divided into 100, and light can be provided at a specific depth among 100 depths.

Thus, for example, the spatial modulation of 100 times is possible, which means that the backlight module 420 can provide light by dividing the depth of reciprocation of the variable focus lens by 100 equally. Providing light to the pixel when it reaches a certain depth can give a precise focus response.

However, it is not necessarily limited to the above values. For example, spatial modulation of 100 or more times or less for one frame (1/60 second) may be possible depending on the modulation response speed of the backlight module 420 and the mirror module 440. For example, on the basis that the projection apparatus enables 200 spatial modulations in one frame, and the variable focus lens reciprocates a predetermined depth range per frame once, the backlight module 420 turns on 200 times per frame. It will have the number of / offs. Of course, the driving speed of the mirror module 440 may be 200 times per frame.

In addition, since the reference time of 1 frame (1/60 second) is also a variable concept, it is not limited. For example, if one frame is 1/120 second, and the projection apparatus is capable of 100 spatial modulations in one frame, and the variable focus lens reciprocates a predetermined depth range per frame once, the backlight module 420 per frame The number of on / off times is 100 times, and thus the number of possible on / off times per second of the backlight module 420 will be 12000 times. Of course, the driving speed of the mirror module 440 may be 12000 times per second. That is, if the variable focus lens reciprocates once per frame, the number of on / off times per frame of the backlight module 420 (N) and The number of driving M per frame of the mirror module 440 is equal to the number of spatial modulations Q per frame of the desired projection device.

Here, if one frame is 1/60 second, the number of on / off times per second of the backlight module 420 and the number of driving times per second of the mirror module 440 are multiplied by 60 of the M and N values derived above. do.

The operation of the backlight module 420 according to the above embodiment will be described below.

The light source unit 430 generates light to be incident on the mirror module 440.

The mirror module 440 may reflect the light generated by the light source unit 430 in the direction of the display module 410 or may reflect it in another direction. Accordingly, the reflected light is selectively incident on the display module 410.

In addition, the light may pass through the display module 410 or may pass through the optical module in a process before being provided to the display module 410. In the process of passing through the optical module as described above, optical modulation of the light may be performed. For example, the light may be modulated to have an appropriate light distribution area, and the modulated light may be provided to the display module 410.

When the mirror module 440 reflects the light generated by the light source unit 430 in the direction of the display module 410, light is provided to the display module 410, and an image is formed on the screen S, so that the user's eye T The image is incident on. In addition, when the mirror module 440 reflects the light generated by the light source unit 430 in a different direction, light is not provided to the display module 410, and thus is not condensed on the screen S so that the user's eyes T ) Does not enter the image. Accordingly, an operation in the form of on / off operation of the light source unit 430 may be implemented according to the operation of the mirror module 440.

The control device 500 controls the lens module 200 and the projector module 400. The control device 500, when the convergence distance by the image provided by the display module 410 and the focal length of the image by the lens module 200 coincide, the backlight module 420 is the It can operate to provide light to the display module 410. Specifically, the light of the light source unit 430 included in the backlight module 420 has a convergence distance due to an image provided by the display module 410 and a focal length of the image by the lens module 200. When matched, the control device 500 may control the mirror module 440 such that light from the light source unit 430 is provided to the display module 410.

According to an embodiment, the driving speed of the mirror module 440 by the control device 500 may have a speed of 60 Hz or more.

As described above, the lens module 200 is composed of a variable focus lens that linearly increases or decreases the focal length of the user's eye T within a predetermined depth range. For example, the focal length by the variable focus lens is 1 frame. While, it is possible to reciprocate a predetermined depth range once. In addition, the control device 500 operates the mirror module 440 so that light from the light source unit 430 is provided to the display module 410 when the image of the display module 410 has a specific focal length by the variable focus lens. By doing so, the image generated by the display module 410 may have a specific focal length and enter the user's eye T. At this time, the point in time when the mirror module 420 provides the light from the light source unit 430 to the display module 410 may be a point in time at which the focal length and the convergence distance by the variable focus lens coincide. Therefore, an image in which the focal length and the convergence distance match each other can be provided to the user. That is, the mismatch between the convergence distance and the focal length can be resolved.

According to an embodiment, the operation of the lens module 200 and the operation of the mirror module 440 may be synchronized with each other by the control device 500. For example, the control device 500 may display the display module 410 at a time when the convergence distance of the image reproduced by the display module 410 and the focal length of the image of the lens module 200 coincide. ). Accordingly, the control unit may include a predetermined control algorithm. That is, when the lens module 200 has a specific focal length, a control algorithm in the control device 400 may operate the light emitting backlight module 420.

As in the above-described embodiment, the image reproduced in the display module 410 may have predetermined image data and convergence distance data. Accordingly, the control device may allow the mirror module 440 to provide light to the display module 410 when the convergence distance of the image stored in the display module 410 and the focal length by the lens module 200 are the same. Can work Accordingly, the control device 500 may include a predetermined control algorithm. That is, the control device 500, when the lens module 200 has a specific focal length, the control algorithm in the control device 500 operates the mirror module 440 to emit light to the display module 410 Can provide.

Therefore, an image in which the focal length and the convergence distance match each other can be provided to the user. That is, the mismatch between the convergence distance and the focal length can be resolved.

In addition, the control device 500 may shift the sweep range of the variable focus lens of the lens module 200. This is as described in the above embodiment.

Referring to Figure 4, the operation of the projection apparatus according to the present invention will be described below. Here, for convenience, the operation of the backlight module 120 of the first embodiment will be described.

The 3D image to be expressed by the display module 110 has 2D image and depth information for each frame. Here, the depth information means a convergence distance. In the 2D image, the original image is reproduced as it is on the display module 110. The image is provided to the user with full brightness only when the backlight module 120 provides light. The depth information determines at what depth the light emitting element 124 located in each pixel of the backlight module 120 is turned on.

When the depth to be expressed by the pixel at the A2 position of the image reproduced by the display module 110 is 1 m, when the lens module 200 implements a focal length of 1 m, the backlight module corresponding to the pixel at the A2 position The light emitting element 124 of the pixel at position A1 of 120 provides light. In addition, when the depth to be expressed by the pixel at the B2 position of the image reproduced in the display module 110 is 100 m, when the lens module 200 implements a focal length of 100 m, the pixel corresponds to the pixel at the B2 position. The light emitting element 124 of the pixel at the B1 position of the backlight module 120 provides light. Accordingly, images having an appropriate depth are formed at positions A3 and B3 of the screen S corresponding to the positions.

5 is a view showing an operation example of the present invention.

First, (a) is an image image generated by the display module 110, and (b) is a depth information image of each region. As described above, the image image generated by the display module has two-dimensional image image data and depth data (focus distance data) of each region of the image image data.

(c), (d) (e), and (f) are 0 Diopter focus, 1 Diopter focus, 2 Diopter focus, and 3 Diopter focus, respectively. The backlight module operates at a focal length that matches the focal length data stored for each area, so that an image of the display module is provided to the user.

Hereinafter, the effects of the present invention will be described.

In the projection apparatus according to the present invention, when the image reproduced in the display module 110 has a focal length of a specific value by the lens module 200, the backlight module 120 is lighted to the display module 110 Gives Therefore, the image generated by the display module 110 may be formed on the screen S in a state having a specific focal length, so that it enters the user's eye T. In addition, when the lens module 200 has a different focal length, light is not provided to the display module 110 so that the image does not enter the user's eye T.

Therefore, the projection apparatus according to the present invention may induce the convergence distance and the focal length of the image reproduced in the display module 110 to match. That is, when the convergence distance induced by the display module 110 and the focal length induced by the lens module 200 coincide with each other, the backlight module 120 operates so that the focal-convergence distance coincides. Can be. Therefore, the focus-convergence mismatch, which is a problem of the conventional projection apparatus, can be solved.

In addition, the projection apparatus according to the present invention can express more than 100 depths based on the currently commercialized technology, which can be expected to solve a more complete focus-convergence mismatch.

In addition, in the projection apparatus according to the present invention, loss of resolution can be prevented.

For example, in a conventional display device that does not solve the focus-convergence mismatch, in the case of the focus-convergence mismatch, when "convergence is coincident but focus is out of focus", an object to be clearly seen experiences blur at this time. This will soon lead to loss of resolution. On the other hand, since the present technology solves the focus-convergence mismatch, there is no loss of resolution.

As another example, considering a conventional focus-inducing display device that provides a continuous focus between two or more depth plane images to solve a focus-convergence mismatch, each depth plane in such a device has a certain depth difference. However, the resolution is sacrificed to express the focus corresponding to the depth. On the other hand, the technology of the present invention is not limited to a limited depth surface such as 2 to 4, but since a plurality of (more than 100) faces that are almost continuous can be expressed, the depth difference between the faces is very small, so there is almost no loss of resolution. That is, unlike the conventional method having a limited number of depth expressions, the projection apparatus according to the present invention has almost no resolution loss.

In addition, the projection apparatus according to the present invention can correct image distortion occurring in the optical system by using a depth-direction degree of freedom. Image distortion refers to optical aberrations in which the depth of the focal plane of the outer edge image and the central image are different. The projection apparatus according to the present invention can calculate and reflect this optical aberration degree in advance and correct it. For example, if the focal plane is formed closer to the edge than the center, it is possible to correct the above image distortion by adopting a method of providing light when the display panel is farther away.

In addition, the projection apparatus according to the present invention is configured to be able to shift the range of sweep of the lens module 200, thereby preventing distortion of image depth depending on the viewing position.

Although preferred embodiments have been described and described above, the present invention is not limited to the specific embodiments described above, and the general knowledge in the technical field to which the present invention pertains without departing from the gist of the present invention claimed in the claims. Of course, various modifications can be carried out by the vibrator, and these modifications should not be individually understood from the technical idea or prospect of the present invention.

Claims

In the projection device,

A projector module that provides a predetermined image on a predetermined screen;

A lens module disposed between the user's eye and the screen; It includes,

The projector module,

A display module that provides a predetermined image; And

A backlight module that provides light to the display module so that an image provided from the display module is formed on the screen; It includes,

The display module is located between the backlight module and the screen,

The display module,

Inducing a convergence reaction in the user's eyes so that the image formed on the screen has a predetermined convergence distance,

The lens module,

A projection device that induces a focus response to a user's eye and changes a focal length of an image reproduced in the display module within a predetermined range.
The method according to claim 1,

Further comprising a control device;

The control device synchronizes the operation of the lens module with the operation of the backlight module,

The convergence distance of the image provided by the display module and

Projection device to induce the focal length of the lens module to match.
The method according to claim 2,

The control device,

When the image provided from the display module has a focal length of a specific value by the lens module,

By operating the backlight module so that the backlight module provides light to the display module,

Projection device that allows the image provided by the display module to have a specific focal length and enter the user's eyes.
The method according to claim 2,

The image provided by the display module has image data and depth distance data,

When the depth distance of the image provided by the display module and the focal length by the lens module coincide,

The backlight module provides light,

Projection device to ensure that the focal-convergence distance matches.
The method according to claim 2,

The backlight module,

Projection device comprising a plurality of light emitting elements.
The method according to claim 5,

The light emitting element,

It is arranged with a predetermined array at the rear of the display module,

The control device,

Projection device to control each of the light emitting elements to be driven binary (on / off).
The method according to claim 2,

The backlight module,

A plurality of light source units, and

It includes a mirror module for generating reflected light by reflecting the light generated by the light source unit,

The control device changes the angle of the mirror module, so that the reflected light selectively enters the display module.
The method according to claim 7,

The control device,

The convergence distance of the image reproduced in the display module,

When the focal length of the image by the lens module coincides,

A projection device that causes reflected light reflected by the mirror module to enter the display module.
The method according to claim 8,

The display module,

Projection device further comprises an optical module that allows the reflected light reflected from the mirror module to have a predetermined area.
The method according to claim 2,

The lens module,

A projection device composed of a variable focus lens that linearly increases or decreases a focal length of an image generated by the display module within a predetermined sweep range for a predetermined time.
The method according to claim 10,

The control device,

A projection device capable of shifting the sweep range of the variable focus lens.
The method according to claim 1,

The backlight module,

When the image reproduced in the display module has a focal length of a specific value by the lens module, the display module operates to provide light to the display module so that the image reproduced in the display module has a specific focal length and enters the user's eye. And

The backlight module,

A plurality of light emitting elements arranged with a predetermined array at the rear of the display module, and

It includes a control device for controlling the operation of the light emitting element,

The control device,

Each light emitting element is controlled to be binary driven (on / off), but the light emitting element has a driving speed of N times per frame, and the convergence distance of the image reproduced in the display module and the image of the image by the lens module. When the focal lengths match, the control device activates the light emitting element to provide light to the display module so that the focal-convergence distances match,

The lens module,

It is composed of a variable focus lens that linearly increases or decreases the focal length of the image generated by the display module within a predetermined range, wherein the variable focus lens reciprocates a predetermined depth range once for one frame.
The method of claim 12,

The 1 frame is 1/60 second,

A projection device in which the binary driving speed N of the light emitting element is 100 times per frame.
According to claim 1,

The backlight module,

When the image reproduced in the display module has a focal length of a specific value by the lens module, the display module operates to provide light to the display module so that the image reproduced in the display module has a specific focal length and enters the user's eye. And

The backlight module,

A plurality of light sources,

Mirror module for generating reflected light by reflecting light generated by the light source unit,

A collimating lens disposed between the light source unit and the mirror module and allowing light generated by the light source unit to have a predetermined area and incident on the mirror module, and

An optical module disposed between the mirror module and the display module, and configured to allow reflected light reflected from the mirror module to have a predetermined area and enter the display module,

The mirror module includes a mirror module, and a control unit for changing the angle of the mirror module,

The reflected light is selectively allowed to enter the display module,

The control unit,

When the convergence distance of the image reproduced in the display module and the focal length of the image by the lens module coincide, reflected light reflected by the mirror module is incident on the display module, but the mirror by the control unit The module has M driving speed per frame,

The lens module,

It is composed of a variable focus lens that linearly increases or decreases a focal length of an image generated by the display module within a predetermined range, wherein the variable focus lens reciprocates a predetermined depth range once for one frame.
The method of claim 14,

The 1 frame is 1/60 second,

The driving speed M of the mirror module is 100 projections per frame.